化学学报 ›› 1997, Vol. 55 ›› Issue (12): 1152-1157. 上一篇    下一篇

研究论文

程序升温分解对PEEK热分解动力学及其机理的研究

何静;段雪;王作新;孙鹏;李峰;喻颍政   

  1. 北京化工大学应用化学系
  • 发布日期:1997-12-15

Study on the kinetics and mechanism of thermal degradation and crosslinking of PEEK by temperature programmed decomposition

HE JING;DUAN XUE;WANG ZUOXIN;SUN PENG;LI FENG;YU YINGZHENG   

  • Published:1997-12-15

本文以程序升温分解法为主要手段,讨论了PEEK的热分解动力学特征,计算了热分解动力学参数;并辅以红外光谱法,探讨了PEEK样品的热分解交联机理。结果发现:PEEK的热分解并不是简单过程,而是分三个阶段进行;相应阶段的活化能分别为296.0kJ/mol,123.7kJ/mol,153.4kJ/mol,反应级数均为一级;第一阶段与第二阶段具有连串反应的动力学特征,而第二阶段与第三阶段具有平行反应的动力学特征。PEEK的热分解由芳醚键的断裂开始,形成自由基,尔后同时发生分解和交联过程,形成小分子化合物及交联结构。

关键词: 反应机理, 红外分光光度法, 动力学分析, 交联, 热分解, 平行反应, 聚醚醚酮, 连串反应, 热动力学, 程序升温分解

The kinetic characteristics of thermal degradation of PEEK was studied by temperature programmed decomposition. The results show that the thermal degradation of PEEK is not a simple process, but proceeds by three stages. The activation energies are 296.0kJ/mol, 123.7kJ/mol, 153.4kJ/mol respectively and the reaction order are 1 for all three stages. The mechanism of thermal degradation and cross linking of PEEK is also discussed. It is concluded that the thermal degradation of PEEK is started from the breakdown of Ar-O bands and the successive degradation is accompanied by thermal crosslinking.

Key words: REACTION MECHANISM, INFRARED SPECTROPHOTOMETRY, KINETIC ANALYSIS, CROSSLINKING, THERMAL DECOMPOSITION, PARALLEL REACTION, POLYETHERETHERKETONE, CONSECUTIVE REACTION, THERMODYNAMICS, TEMPERATURE PROGRAMMED DECOMPOSITION

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